Few small stylistic fixes per comments by @paulromano
Few small stylistic fixes per comments by @paulromano

wbinventor/openmc,smharper/openmc,walshjon/openmc,liangjg/openmc,shikhar413/openmc,amandalund/openmc,mit-crpg/openmc,walshjon/openmc,amandalund/openmc,smharper/openmc,mit-crpg/openmc,smharper/openmc,shikhar413/openmc,mit-crpg/openmc,johnnyliu27/openmc,wbinventor/openmc,mit-crpg/openmc,amandalund/openmc,johnnyliu27/openmc,walshjon/openmc,shikhar413/openmc,paulromano/openmc,johnnyliu27/openmc,shikhar413/openmc,paulromano/openmc,johnnyliu27/openmc,paulromano/openmc,wbinventor/openmc,paulromano/openmc,liangjg/openmc,liangjg/openmc,walshjon/openmc,liangjg/openmc,smharper/openmc,wbinventor/openmc,amandalund/openmc